Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection
Water-soluble and reductive carbon quantum dots (CQDs) were fabricated by the hydrothermal carbonization of chitosan. Acting as a reducing agent and stabilizer, the as-prepared CQDs were further used to synthesize gold nanoparticles (AuNPs). This synthetic process was carried out in aqueous solution...
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MDPI AG
2018-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/8/12/1043 |
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| author | Juanjuan Song Li Zhao Yesheng Wang Yun Xue Yujia Deng Xihui Zhao Qun Li |
| author_facet | Juanjuan Song Li Zhao Yesheng Wang Yun Xue Yujia Deng Xihui Zhao Qun Li |
| author_sort | Juanjuan Song |
| collection | DOAJ |
| description | Water-soluble and reductive carbon quantum dots (CQDs) were fabricated by the hydrothermal carbonization of chitosan. Acting as a reducing agent and stabilizer, the as-prepared CQDs were further used to synthesize gold nanoparticles (AuNPs). This synthetic process was carried out in aqueous solution, which was absolutely “green„. Furthermore, the CQDs/AuNPs composite was used to detect iodine ions by the colorimetric method. A color change from pink to colorless was observed with the constant addition of I<sup>−</sup> ions, accompanied by a decrease in the absorbance of the CQDs/AuNPs composite. According to the absorbance change, a favorable linear relationship was obtained between ΔA and I<sup>−</sup> concentration in the range of 20⁻140 μM and 140⁻400 μM. The detection limit of iodide ions, depending on the 3δ/slope, was estimated to be 2.3 μM, indicating high sensitivity to the determination of iodide. More importantly, it also showed good selectivity toward I<sup>−</sup> over other anion ions, and was used for the analysis of salt samples. Moreover, TEM results indicated that I<sup>−</sup> ions induced the aggregation of CQDs/AuNPs, resulting in changes in color and absorbance. |
| first_indexed | 2024-12-12T18:13:54Z |
| format | Article |
| id | doaj.art-7fd0f05acd264f86ae99df16602e17cf |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-12T18:13:54Z |
| publishDate | 2018-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-7fd0f05acd264f86ae99df16602e17cf2022-12-22T00:16:19ZengMDPI AGNanomaterials2079-49912018-12-01812104310.3390/nano8121043nano8121043Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions DetectionJuanjuan Song0Li Zhao1Yesheng Wang2Yun Xue3Yujia Deng4Xihui Zhao5Qun Li6School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, ChinaSchool of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, ChinaSchool of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, ChinaSchool of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, ChinaSchool of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, ChinaSchool of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, ChinaSchool of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, ChinaWater-soluble and reductive carbon quantum dots (CQDs) were fabricated by the hydrothermal carbonization of chitosan. Acting as a reducing agent and stabilizer, the as-prepared CQDs were further used to synthesize gold nanoparticles (AuNPs). This synthetic process was carried out in aqueous solution, which was absolutely “green„. Furthermore, the CQDs/AuNPs composite was used to detect iodine ions by the colorimetric method. A color change from pink to colorless was observed with the constant addition of I<sup>−</sup> ions, accompanied by a decrease in the absorbance of the CQDs/AuNPs composite. According to the absorbance change, a favorable linear relationship was obtained between ΔA and I<sup>−</sup> concentration in the range of 20⁻140 μM and 140⁻400 μM. The detection limit of iodide ions, depending on the 3δ/slope, was estimated to be 2.3 μM, indicating high sensitivity to the determination of iodide. More importantly, it also showed good selectivity toward I<sup>−</sup> over other anion ions, and was used for the analysis of salt samples. Moreover, TEM results indicated that I<sup>−</sup> ions induced the aggregation of CQDs/AuNPs, resulting in changes in color and absorbance.https://www.mdpi.com/2079-4991/8/12/1043carbon quantum dotschitosangold nanoparticlesIodine ions detection |
| spellingShingle | Juanjuan Song Li Zhao Yesheng Wang Yun Xue Yujia Deng Xihui Zhao Qun Li Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection Nanomaterials carbon quantum dots chitosan gold nanoparticles Iodine ions detection |
| title | Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection |
| title_full | Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection |
| title_fullStr | Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection |
| title_full_unstemmed | Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection |
| title_short | Carbon Quantum Dots Prepared with Chitosan for Synthesis of CQDs/AuNPs for Iodine Ions Detection |
| title_sort | carbon quantum dots prepared with chitosan for synthesis of cqds aunps for iodine ions detection |
| topic | carbon quantum dots chitosan gold nanoparticles Iodine ions detection |
| url | https://www.mdpi.com/2079-4991/8/12/1043 |
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